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ACCOUNTING POLICIES (Details 2) (USD $) In Millions, unless otherwise specified			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Structures Minimum	Dec. 31, 2012 Structures Maximum	Dec. 31, 2012 Revenue equipment Minimum	Dec. 31, 2012 Revenue equipment Maximum	Dec. 31, 2012 Equipment and Other Minimum	Dec. 31, 2012 Equipment and Other Maximum	Dec. 31, 2012 Capitalized software costs Minimum	Dec. 31, 2012 Capitalized software costs Maximum	Dec. 31, 2012 Purchased software applications Maximum
Property, Plant and Equipment
Depreciation/amortization period			15 years	20 years	3 years	12 years	2 years	15 years	2 years	3 years	7 years
Impairment Assessment of Long-Lived Assets
Assets held for sale which are reported within other noncurrent assets	$ 1.0	$ 2.5
Asset Retirement Obligations
Estimated asset retirement obligation	$ 2.5	$ 2.2

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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